Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net loss	$ (2,251)	$ (216)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Realized loss on marketable debt securities	4	100
Depreciation and amortization	202	190
Stock-based compensation expense	376	234
Changes in operating assets and liabilities:
Accounts receivable	2,230	582
Escrow receivable	2
Inventory	(123)	(855)
Prepaid and other assets	193	132
Accounts payable and accrued expenses	43	(219)
Other liabilities	(200)	10
Accrued sales allowance, discontinued operations		(17)
Assets held for sale		22
Net cash provided by (used in) operating activities	476	(37)
Cash flows from investing activities
Purchase of marketable securities	(1,298)	(9,589)
Proceeds from maturities of marketable debt securities		11,930
Proceeds from sale of marketable debt securities	3,319	9,574
Capital expenditures	(73)	(24)
Net cash provided by investing activities	1,948	11,891
Cash flows from financing activities
Payment of dividends	(2,929)	(11,700)
Proceeds from exercise of stock options		338
Net cash used in financing activities	(2,929)	(11,362)
Increase (decrease) in cash and cash equivalents	(505)	492
Cash and cash equivalents, at the beginning of the period	1,554	3,173
Cash and cash equivalents, at the end of the period	1,049	3,665
Supplemental disclosure of non-cash investing and financing activities:
Net unrealized gain, investments in marketable debt securities	$ 23	$ 25